I am struggling to get object handled properly when returned from WebMethod. Conditions (my research after it):
Simple class to hold the properties:
public class memberLogin
{
public string Username {get; set;}
public string Password {get; set;}
}
Serialization method:
public static string JsonSerializer<T>(T t)
{
DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T));
MemoryStream ms = new MemoryStream();
ser.WriteObject(ms, t);
string jsonString = Encoding.UTF8.GetString(ms.ToArray());
ms.Close();
return jsonString;
}
(simplified for clearness) Webmethod
[WebMethod(EnableSession = true)]
public static string getCredentials()
{
memberLogin ml = new memberLogin();
ml.Username = "user";
ml.Password = "pass";
string json = JsonHelper.JsonSerializer<memberLogin>(ml);
return json;
}
return null;
}
And JavaScript
$("#element").live("click", function (e) {
$.ajax({
type: "POST",
url: "Default.aspx/getCredentials",
data: "{}",
contentType: "application/json; charset=utf-8",
dataType: "json",
async: false,
cache: false,
success: post_to_url
});
});
function post_to_url(params) {
method = "post";
path = "http://example";
var form = document.createElement("form");
form.setAttribute("method", method);
form.setAttribute("action", path);
for(var key in params) {
if(params.hasOwnProperty(key)) {
var hiddenField = document.createElement("input");
hiddenField.setAttribute("type", "hidden");
hiddenField.setAttribute("name", key);
hiddenField.setAttribute("value", params[key]);
form.appendChild(hiddenField);
}
}
document.body.appendChild(form);
form.submit();
}
When debugging, WebMethod returns "{\\"Password\\":\\"pass\\",\\"Username\\":\\"user\\"}"
so it seems to be what I want it to be (key, value par), except the \\
but that is how it is serialized. However when retrieved using ajax, I can not get any values out of it. alert(params)
gives object Object
, call to params.Username gives undefined
. Is there something I am missing? Some sort of cast? I thought that if object is serialized, then there's no such need. Sorry for very long post but I tried to provide as much informations as I could.
You have to parse the JSON String into a JSON object. In Javascript:
var user = JSON.parse(params.responseText);
var username = user.Username;
var password = user.Password;
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.